According to the window sticker that
will be plastered on all new Volts sold in the U.S., the vehicle is
rate at an equivalent of 93 mpg when running on electricity, and a
more sedate 37 mpg when the gasoline engine kicks in after the
battery is depleted. This two figures combined give the Volt a
"composite" rating of 60 mpg.

And here are some more numbers -- the
Volt will have an official "battery only" range of 35
miles, while the total driving range (taking into account the
batteries and the gasoline tank) will be 379 miles.

You make it sound like it's a bad thing that EVs have a more efficient motor. That's pretty much the only reason EVs are worth looking at after all. ICEs could barely manage half the efficiency at best that most electric motors have now.